Quote Originally Posted by Captain Gizmo View Post
Sport Dog owns the patent on the idea of combining a location collar with a command collar. The other makers have to go around this by making a location collar that has a pocket in the collar for the command receiver (or vice versa). Not sure how broad the patent is. At any rate Marshall is probably constrained from making a tidy "all in one" unit.

Regards,
Thomas of the Desert
I am not a big fan of "all in one" units of any type. Any idea how many of those televisions with built in DVD players there are out there with a broken DVD player? In this case if something happens with the training collar functionality it could suck the battery dry and you are left with no way to track your dog.